Rock and sand heater and grader



J. J. BROWN. ROCK ANQSAND HEATER AND GRADER I APPLICATION HLED OCT- 3, 1921- r I ji zggmgyw I i Patemed Oct. 3 ,1922,

. 2 SHEETS-SHEET l.

J. J. BROWN. ROCK AND SAND HEATER AND GRADER. APPLICATION FILED OCT. 8. 1921.

Patented 0c.3,1922.

2 SHEETS-SHEET 2.

Patented 0m. 3, 1922.

pairs sra'rss earasir JESSE J. BROWN, or nav-wanncamronnmj ROCK AND SAND HEATER AND GRADER.

appease, filed October a, 1921. Serial in. 5 8,393.

To all whom it may concern:

Be it known that I, Jnssn J. BROWN, a citizen of the United States, residing in Hayward, Alameda County, and State of California, have inventeda new and useful Improvement in a Rock and Sand Heater and Grader, of which" the following is a specification. v u

My invention relates to improvements in rock and sand graders and heaters wherein a revolving grading screen operates in conjunction with grading chutes arranged to form a tortuous passage through a heatlng chamber, within which the screen is mounted, to grade and heat sand, and rock for asphalt road building purposes.

The primary object of, the p tion is to provide a new and improved rock and sand heater and grader. I

Anotherobject of the present invention isto provide a new and improved rock and sand heater of simple construction and havmg few parts of simple andcheap manu facture, to reduce the cost of producing and maintaining the device.

A. further object of the invention is to provide an improved rock andsand heater and grader arranged to exp'osethe rock and sand to the action of heat through a period of time substantially proportionate to the mass of the separate particles whereby throughout the said specification and drawings, and in which:

Fig. '1 is a vertical longitudinal sectional view of myimproved rock and sand heater and grader, disclosing the manner in which the tortuous heat passages are formed by the grading chutes Fig. 2 is a transverse sectional view furresent inventhe r; disclosing the arrangement of the tortuous heat passages; and

Fig; 3 an end elevationof the device.

Referring to the drawings the numerall is used to designate in general a suitable housing whose interior constitutes a heat ing chamber 2, the lower portion of said chamber 2 being provided with fire-brick orlining 3 to provide a-fire-box heated by a suitable burner 4.

Above the firehoi: are arranged a series of inclined converging delivery chutes 6 and still higher two series of oppositely inclined J battle plates .7 and between said; chutes 6 and 7 are provided partitionsfi extending,v

at a point immediately above the. chutes v only part way across the-heating chamber 2, the said chutes, plates and partitions be-,

g arranged to form tortuousiheat pasesages upward from the fire-box to the top of the heating chamber 2 and to a suitable stack 11 at thetop of the housingl.

A. revolving screen 12 is rotatably mounted at a slightangle within the upper portion of the heating chamber 2 and is provided with screen sections of successively enlarged mesh, the smaller mesh being at the upper end of the inclined screen 12, the purpose of which will hereinafter be more fully set forth.

A suitable filling or supply chute 14 is arranged to feed material into the upper end of the screen 12 and a suitable pulley 15 is provided at the lower end of the shaft 16 which supports the screen 12 so that said screen maybe rotated from any suitable source of power, not shown.

lnfpractice a mixture of sand and rock.

of different sizes is introduced into the upper endof the screen 12 through the feeding chute-14. As the screen 12 is revolved the material therein is agitated to facilitate exposure of the particle of the material there in to the action of; heat passing fromthe fire-box through the tortuous passages around the chutes 6 and partitions 8. As

the particles of rock, said sand particles willbe heated much more quickly than the particles of rock.

the particles of sand contain less mass than the sand is heated and the dampness and agitated for a longer period of The coarser material held within the screen 12 by the finer meshes at the upper end thereorwill be held within the screen than the sand and, therefore, sub-jected'to the action or the heat passing through said screen for a longer period, until said coarser particles reach a portion ofthe successively larger meshes which will permit their passage.

This retention or the coarser material Within the revolving screen is a novel fea ture of the present invention as it produces a uniformly heated material when the various grades are again assembled within the asphaltic mixture and further efiects a saving of heat'and 'fuel for the reason that no portion is held long enough to be overheated While waiting rorsuflicient heat to be im parted to theother particles or the mixture.

The still coarser particles are further retarded by the grading facilities of the revolving screenuntil they are carried to the proper meshes which will permit their pasarate'particles, thereby securing a uniformly heated mass when the separated and graded particles are again assembled in an asphaltic mixture.

These particles are further heated in their passage over the heated and oppositely inclined bailie plates 7 as well as by passing through the heat or the tortuous passages which passages extend between said ballie plates? as well as between and around the delivery chutes 6. I g

It, is thus obvious that the period of time consumed by the passage of any particle through the screen and heating chamber is proportionate with its mass. Or in other words, the particleis retarded in its passage through the heating chamber so that the period of time during which said particles areeirposed to the action or heat within the heating chamber is proportionate to its mass,

thereby eltecting auniform heat to all particles of all sizes."

Having thus described my invention What I claim as new and desire secure by Let tersflatent is;

'1." A: rock and sandheater and drier comprising atheating chamber; grading chutes mounted Within said chamber and arranged time heat passages.

to form tortuous heat passages upwardly through said chamber; a revolving screen mounted within the chamber and above the grading chutes therein said screen having sections or successively enlarged meshes whereby material introduced thereinto may be retained and exposed to the action or heatwithin the chamber during a period or time substantially proportionate to the mass of particles or said material; and means for revolving the screen to facilitate exposure the material therein to the act-ion of heat within said chamber.

2. A rock and sand heater and grader comprising aheat'ing chamber; a series of inclined grading chutes mounted Within the chamberandarranged to form tortuousheat passages through said chamber; a revolvim screen mounted within said chamber an above the chutes therein and arranged to grade and separate rock and sand delivered therein and to deliver separate grades to separate chutes; and inclinedbaflie plates arranged below the screen and above the chut and. arranged to receive the graded material from said screen and to deliver the;

same to said chutes through the tortuous 3. A rock and sand heater and drier corn L c u r 1 Jrisng a hea ln chamber; grading chutes mounted within said chamber and arranged to form tortuous heat passages upwardly through said chamber; a revolving screen mountedwithin the chamber and above the grad'ing chutes therein. said screen having sections of successively enlarged meshes.

whereby material introduced thereinto may be retained and exposed to the action or heat within the chamber duringa period of time substantially proportionate to the mass of the particles of saidmaterial; means for revolving the screen to facll tateexposure of the material thereinitothe action of heat within saidchamber; and IDQSLIIS'TOI deliver- .ing material to the screen at the end thereof. containing the smallest mesh.

grader 4. A rockand sand heater and comprising a'heating chamber; a series of I inclined grading chutes mounted Withinthe chamber and arranged to form tortuous heat passages through said chamber; 'arevolving screen mounted within said chamber and above the chutes therein and arranged to grade and separate rock and sand delivered same to said achutesthrough the tortuous heat passages and means for delivering matei-ial'jto the screenat the end thereof cons taining the smallest mesh.

- 5. ,A rock and sand heater and grader comprising a heating chamber; a series of inclined grading chutes mounted Within the chamber and arranged to form tortuous heat passages through said chamber; a revolving screen mounted Within said chamber and above the chutes therein and arranged to grade and separate rock and sand delivered therein and to deliver separate grades to separate chutes; inclined baffle plates arranged belovv the screen and above the 10 chutes and arranged to receive the graded material from said screen and to deliver the same to said chutes through the tortuous heat passages; means for delivering material to the screen at the end thereof containing the smallest mesh; and means for 1 heating the heating chamber.

In Witness whereof I hereunto set my signature.

JESSE J. BROWN. 

